﻿/**
 * JSON类
 * @namespace JSON
 * @name JSON
 * @static
 * @see Based on <a href="http://www.JSON.org/js.html">www.JSON.org</a>.
 */
if(!window.JSON) (function () {
    window.JSON = {};
    function f(n) {
      return n < 10 ? '0' + n : n;
    }
    if (typeof Date.prototype.toJSON !== 'function') {
      Date.prototype.toJSON = function (key) {
        return isFinite(this.valueOf())
          ? this.getUTCFullYear() + '-' +
            f(this.getUTCMonth() + 1) + '-' +
            f(this.getUTCDate()) + 'T' +
            f(this.getUTCHours()) + ':' +
            f(this.getUTCMinutes()) + ':' +
            f(this.getUTCSeconds()) + 'Z'
          : null;
      };
      String.prototype.toJSON = Number.prototype.toJSON = Boolean.prototype.toJSON = function (key) {
        return this.valueOf();
      };
    }
    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
      escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
      gap,
      indent,
      meta = {
        '\b': '\\b',
        '\t': '\\t',
        '\n': '\\n',
        '\f': '\\f',
        '\r': '\\r',
        '"' : '\\"',
        '\\': '\\\\'
      },
      rep;
    function quote(string) {
      escapable.lastIndex = 0;
      return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
        var c = meta[a];
        return typeof c === 'string' ? c : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
      }) + '"' : '"' + string + '"';
    }
    function str(key, holder) {
      var i,
          k,
          v,
          length,
          mind = gap,
          partial,
          value = holder[key];
      if (value && typeof value === 'object' && typeof value.toJSON === 'function') {
        value = value.toJSON(key);
      }
      if (typeof rep === 'function') {
        value = rep.call(holder, key, value);
      }
      switch (typeof value) {
        case 'string':
          return quote(value);
        case 'number':
          return isFinite(value) ? String(value) : 'null';
        case 'boolean':
        case 'null':
          return String(value);
        case 'object':
          if (!value) {
            return 'null';
          }
          gap += indent;
          partial = [];
          if (Object.prototype.toString.apply(value) === '[object Array]') {
            length = value.length;
            for (i = 0; i < length; i += 1) {
              partial[i] = str(i, value) || 'null';
            }
            v = partial.length === 0
                ? '[]'
                : gap
                ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']'
                : '[' + partial.join(',') + ']';
            gap = mind;
            return v;
          }
          if (rep && typeof rep === 'object') {
            length = rep.length;
            for (i = 0; i < length; i += 1) {
              if (typeof rep[i] === 'string') {
                k = rep[i];
                v = str(k, value);
                if (v) {
                  partial.push(quote(k) + (gap ? ': ' : ':') + v);
                }
              }
            }
          } else {
            for (k in value) {
              if (Object.prototype.hasOwnProperty.call(value, k)) {
                v = str(k, value);
                if (v) {
                  partial.push(quote(k) + (gap ? ': ' : ':') + v);
                }
              }
            }
          }
          v = partial.length === 0
              ? '{}'
              : gap
              ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}'
              : '{' + partial.join(',') + '}';
          gap = mind;
          return v;
      }
    }
    /**
     * 将JSON转化为字符串
     * @name JSON.stringify
     * @function
     * @grammar JSON.stringify(value)
     * @param {Object} value 待转化的JSON对象
     * @memberOf JSON#
     * 
     * @returns {String} 由JSON转化的字符串
     */
    if (typeof JSON.stringify !== 'function') {
      JSON.stringify = function (value, replacer, space) {
        var i;
        gap = '';
        indent = '';
        if (typeof space === 'number') {
          for (i = 0; i < space; i += 1) {
            indent += ' ';
          }
        } else if (typeof space === 'string') {
          indent = space;
        }
        rep = replacer;
        if (replacer && typeof replacer !== 'function' && (typeof replacer !== 'object' || typeof replacer.length !== 'number')) {
          throw new Error('JSON.stringify');
        }
        return str('', {'': value});
      };
    }
    /**
     * 将字符串转化为JSON
     * @name JSON.parse
     * @function
     * @grammar JSON.parse(text)
     * @param {String} text 待转化的字符串
     * @memberOf JSON#
     * 
     * @returns {Object} 由字符串转化的JSON
     */
    if (typeof JSON.parse !== 'function') {
      JSON.parse = function (text, reviver) {
        var j;
        function walk(holder, key) {
          var k, v, value = holder[key];
          if (value && typeof value === 'object') {
            for (k in value) {
              if (Object.prototype.hasOwnProperty.call(value, k)) {
                v = walk(value, k);
                if (v !== undefined) {
                  value[k] = v;
                } else {
                  delete value[k];
                }
              }
            }
          }
          return reviver.call(holder, key, value);
        }
        text = String(text);
        cx.lastIndex = 0;
        if (cx.test(text)) {
          text = text.replace(cx, function (a) {
            return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
          });
        }
        if (/^[\],:{}\s]*$/
            .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
            .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
            .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
          j = eval('(' + text + ')');
          return typeof reviver === 'function' ? walk({'': j}, '') : j;
        }
        throw new SyntaxError('JSON.parse');
      };
    }
  }
)();